Ryan, I think if you look at the actual testing, you will see AV makes the most difference when the saw is being piss revved (not in the wood), hence why I prefer it for a limbing saw. With a long bar/powerful saw, my dogs are usually in the wood, and the AV is not as important to me. That said, I have found the 576 and 661 do seem very smooth when bucking.
As you have noted before, I don't do it every day, so it is not that big a deal to me.
Compared to my old Homelites, all of my Stihls seem like extremely good AV! When I used to cut in the cold with the Homelite, my hands would keep vibrating for about 15 minutes after the cutting was done. I have no ill effects from any of my saws now.